Doepfer A-105 SSM 24dB Lowpass Filter example

This is a beautiful 24dB filter with a brilliant and somewhat rough sound, quite different from the A-108 Transistor Ladder. For technical details, please see Doepfer’s Homepage:

http://www.doepfer.de/a105.htm 

This example uses three A-110 VCOs (sawtooth, one VCO is tuned down 1 oct), cutoff frequency is modulated by an Envelope Generator and the A-155 sequencer (same track that controls VCO pitch), Resonance (called “Q” here) is controlled by a second A-155 track. Btw., the examples here are not intended for some kind of “scientific” comparison between modules. On the contrary, I would like to show some characteristics in a somewhat musical context.

Here we go:

http://www.andreaskrebs.de/assets/media/A-105.mp3

Since the A-105 allows for some nice overdrive, we increase the input volume during the track.

Andreas